import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposePathEffect;
import android.graphics.CornerPathEffect;
import android.graphics.DashPathEffect;
import android.graphics.DiscretePathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathDashPathEffect;
import android.graphics.SumPathEffect;
import android.graphics.PathEffect;
import android.os.Bundle;
import android.view.View;
public class PathTest extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
}
class MyView extends View
{
float phase;
PathEffect[] effects = new PathEffect[7];
int[] colors;
private Paint paint;
Path path;
public MyView(Context context)
{
super(context);
paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(4);
// 创建、并初始化Path
path = new Path();
path.moveTo(0, 0);
for (int i = 1; i <= 15; i++)
{
// 生成15个点,随机生成它们的Y座标。并将它们连成一条Path
path.lineTo(i * 20, (float) Math.random() * 60);
}
// 初始化7个颜色
colors = new int[] { Color.BLACK, Color.BLUE, Color.CYAN,
Color.GREEN, Color.MAGENTA, Color.RED, Color.YELLOW };
// -----------下面开始初始化7中路径效果----------
// 不使用路径效果。
effects[0] = null;
// 使用CornerPathEffect路径效果
effects[1] = new CornerPathEffect(10);
// 初始化DiscretePathEffect
effects[2] = new DiscretePathEffect(3.0f, 5.0f);
}
@Override
protected void onDraw(Canvas canvas)
{
// 将背景填充成白色
canvas.drawColor(Color.WHITE);
// 初始化DashPathEffect,DashPathEffect有动画效果
effects[3] = new DashPathEffect(new float[] { 20, 10, 5, 10 },
phase);
// 初始化PathDashPathEffect,PathDashPathEffect有动画效果
Path p = new Path();
p.addRect(0, 0, 8, 8, Path.Direction.CCW);
effects[4] = new PathDashPathEffect(p, 12, phase,
PathDashPathEffect.Style.ROTATE);
// 初始化PathDashPathEffect
effects[5] = new ComposePathEffect(effects[2], effects[4]);
effects[6] = new SumPathEffect(effects[4], effects[3]);
// 对Canvas执行坐标变换:将画布“整体位移”到8、8处开始绘制
canvas.translate(8, 8);
// 依次使用7中不同路径效果、7种不同的颜色来绘制路径
for (int i = 0; i < effects.length; i++)
{
paint.setPathEffect(effects[i]);
paint.setColor(colors[i]);
canvas.drawPath(path, paint);
canvas.translate(0, 60);
}
// 改变phase值,形成动画效果
phase += 1;
invalidate();
}
}
}
Android学习之path类,布布扣,bubuko.com
Android学习之path类